Im assuming this is Deja Thoris and Woola? I agree with the first post. There are other issues here much more important than the lighting and composition. Personally, I would set it aside, work on fundamentals of anatomy, composition, drawing etc... Then I would start over with thumbnails and start posting for critique and help at that stage, not after you have invested alot of time into rendering and painting. Buy some Loomis books from Amazon, go through them. Accurate drawing takes work, and an understanding of form and structure.

Personally, if i were a moderator id ban you @Razorleaf for being so childish and spiteful. but im not. so i'll just say... this forum is a place where people come to help us out with honest advice. i totally agree with lag, artfix and giacomo. your form is weak and your lighting and value doesnt read. i could sit here and patt you on the head and tell you it looks amazing, but that wouldn't be true or helpfull. i would advise studying a lot more. epecially structure and volume. still life, lifedrawing and cast drawing is good practice.

Also @giacomo - i wouldn't resort to her behaviour as it just makes you look bad aswell.

i think texture is the last thing that lizard needs. if you step back from your monitor and squint at that lizard it doesnt read as anything. i would say this image sholdnt be salvaged. not that it can't be, just rather i don't see the point. you could either push this image to the best of your current ability, or go and work on your fundamentals and improve what you can produce. then start another illustration in a few months with a better skill set.

Just to be clear - all three of you are criticizing the pose, the face and the clothing. Okay ... hahahaha.

Yeah I don't get it. Ones capability to perceive problems in something doesn't always go hand in hand with one's own skills, something you noticed yourself when in your OP you said something is wrong with the lighting, despite that you can't fix it on your own.

But I agree with the others, the pose is pretty stiff, yet her hair seems to be fluttering up, there's little form in her top (making it look like her other breast is flatter), the lizard is inconsistent in its shape (its other eye protrudes oddly and nostrils seems to be off-center) and overall most of the woman's body seems pretty flat (her nose/face especially) and the anatomy is kinda on the wobbly side. Her neck looks really thick, but her hands look pretty small. The values get lost in each other, the lightest part of her arms melds to the sky.

Think about what is she doing. If she's looking at something (or nothing), what does she feel? Pose in front of a mirror standing naturally. Do you lift your arms up like that?